Safety hook



July 14, 1925..

w. P. CUNNINGHAM SAFETY uoox Filed Oct. 2'7. 1924 2 Sheets-Sheet 1 Ill July 14, 1925. 1,546,208 w. P. CUNNINGHAM SAFETY HOOK Filed 001;. 27, 1924 2 Sheets-Sheet 2 14 7 671 i'zizi'iiy/iaim 61m" nag Hooks, of which the Patented July 14, 1925.

UNITED STATES WINTFORD P. CUNNINGHAM,

01 TULSA, OKLAHOMA.

SAFETY HOOK.

Application filed October 27, 1924. Serial Ito. 746,119.

To all whom it may concern:

Be it known that I, WINTFORD P. CUN- NINGHAM, a citizen of the United States, residing at Tulsa, in the county of Tulsa an State of Oklahoma, have invented certain new and useful Improvements in Safety following is a specification.

My invention relates generally apparatus, and in particular ments used in hoisting well rods, casing.

Ob ects of the invention are: to provide a hook for hoisting engagement with elevators attached to rods, having weight operated automatic hook latching means; to provide a hook of this character equipped with manually operated grip controlled latch releasing means; and to provide a hook of this character so constructed and formed that the latch and release mechanism are protected against accidental operation through fouling of well rigging.

With these objects in view, and such others as will be apparent from the description, the invention resides in the novel construction, combination and arrangement of parts hereinafter described and claimed, and illustrated in' the accompanying drawings, wherein:

Figure 1 is a vertical section through a hook constructed in accordance with the principles of the invention,

to oil well to impletubing and with certain parts of the mechanism in elevation; I Figure 2, a horizontal section on line 2-2 of Fig. 1;

Figure 3, a vertical section on line 33 of Fig. 2;

Figure. 1, a vertical section on line 4-4 of Fig. 3;

Figure 5, a horizontal section on line 5-5 of Fig. 1.

In the. preferred embodiment of the invention, as shown, the hook is constructed of a casting 10 provided at its upper end with a swiveled link 11 for engagement with a hoisting cable in the usual manner. At its lower end the casting is formed to provide a hook 12, internally slotted to receive therein in nested r lation a trigger member 13 when the hook isla-tched.

The tip 14 of hook 12 is offset from the body of the casting which between the hook a d it conne th t e nk 1 i rmed unit in set position against action of of spaced side walls 15 and 16 connected throughout their length by a cross web '1 Adjacent the web 17 the body of the casting is formed with an offset hand grip portion 18 channeled to receive in slidable nesting relation a movable supplemental grip member 19 carrying intermediate its ends a rigid bolt 20 slidably disposed through the web 17 for a purpose hereinafter explained. A coil expansion spring having one end retained in a socket formed for the purpose in the supplemental grip 19 and the other end bearing against the inner face of the grip 18, acts normally to force the bolt in projected position through web 17.

The body of the trigger 13 is shaped to conform to the contour of hook 12, and is provided with an integrally formed upstanding shank 22 at its inner end, whic shank is reduced in cross-section and is enlarged laterally at its upper end into the head 23. The entire trigger unit comprising trigger 13, shank 22 and head 23 is slidable vertically within the casting between the side walls 15 and 16, being normally drawn upwardly into the position illustrated in Figure 3 by means of a coil contraction spring 24 connected between a lug 25 formed in the casting at the end of the spring recess socket 26, and a reduced web 27 on the trigger unit head 23. An integral stop lug 28 on the upper edge of head 23 serves to limit the upward movement of the unit. Beneath the head 23, the walls of the casting are connected by a transverse pin 29, which in conjunction with the web 1 forms a guide for the trigger shank 22.

Adjacent its upper edge, the head 23 of the trigger unit is provided with a keeper socket 30, which, when the trigger is in lowered position, receives the spring projected bolt 20 of the supplemental grip member 19, elfectively holding the trigger the spring 24.

The latch mechanism for the hook comprises a bifurcated latch member having a terminal web 31 and side arms 32 and 33 which straddle the shank 22 and head 23 of the trigger unit between the sides of the shank and head and the walls of the casting, with the terminal 31 disposed to engage the hook tip 1 1 in abutting relation when the l h is unction g, The inner nd o the and the casting walls with vertical slots 37,

ill

' 'Wrffigllt theifile i pulls down the trigger against action ot the f d i a h rise to open position shown in Figure 3 perthis object, thacasting is rounded off to proarms 32 and 33 are 'ournalled on a pivot pin and changes may be made in the structural- 34 secured in the sides of a cut away portion in the web 17, so that the latch 'i'nemher 1s pivoted for vertical rocking movement in the casting. Operatingconnection between 1. A safety hook comprising a hook m n- Z the trigger unit and latch member issecurednher, alatch for said liriioli: by means of a Minnector pin 35 disposed means for throwing said latch over said through the respective members and side walls of the casting, the arms 32 and 33 engaged eing provided withlongitudinal slots 35,

ty hook comprising a hook memher, a latch for said hook member,

to permit necessary play of the pin therein. for operating said latch, by the weight of Hooks constructed in accordance with the the member engaged, and manually operatprinciples of this invention, are designed as ed latch release means carried by said hook. safety hooks, wherein when in service the hook is latched to prevent any possibility of disengagement of the hook and an elevator. a trigger in said hook for throwing said In normal latch, upon engagement by a member to be of the device assume the position shown in lifted, means for locking said latch in closed Figure 3, with the latch 31. open and the position, and handle grip means for releastrigger 13 in raised position above the hook 12. The stop lug 28 of the trigger unit head 23, is of a height to assure that the body of h a, ht o rated trigger 13 will not rise above the sides of it, i th 9mm f d the hook l2, operation, the handle 18 1s grasped and the hook swung into engagement with an elevator link which rests on ll the trigger 13. When th e hookisllifted the mjpw ll/Qll and attached} her, a latch for closing said hook member,

mg said latch.

4. A safety hook comprising a hook memtrigger disposed latch.

hook comprising a casting ook at one end, a weight operin said casting, a pivoted latch in i casting controlled by said trigger to automatic latch lock in le grin on said eastin grip or releasing said lowered the latch 31 will d against the hook .tip 14 in the position id ti a h d shown 1n Figure l. As the keeper socket of d means i id the t igger unit head comes into alignment l t h l k with the bolt 20, the action ofspring 21 will 6. A f t 1 1; cfimprisjng a ti p j the bolt into the socket $5665? 3 formed in a liook at one end, said hook hat locking the hook in closed position. When m Tap 35 thgrein Wgight t a t i it is desired to release the hook, the operator ger i id recess, hook latch pivoted in tightens the p p ppl m a head formed on said trigger p member, drawing asemet and. in connection with said latch, an auto action P 5 21 retract mil matically operable locking bolt in said castlfilease of the g e 9? retraqtlon of ing for engagement with said trigger head h bolt, the F I be mlsmh to look said latch in closed position, a handle will tend to ra se, under action of the spring a rap formed on said castn and manually 2am The hook is manipulated to relieve presh sure on the trigger, whereupon the latch will 7. A safety hook comprising a casting, a mlttmg release of the hook p slotted hook forms in sand casting, a i X of the 5 midi/19H handle grip formed on said casting, a mmdie a g l i i the weight operated trigger slidably disposed supplemental a p 19 constlliutlng the latch in the slotted portion of said hook, a shank release mechanlsm, so that any possibility of the latch release becomin fouled in the well rigging is eliminated. ."rkdrhtlonally toei'eet slidable within said casting, a latch for said hook pivoted in said casting, operating connection between said latch and trig yide a surface that Wlll not become caught ger head, a spring projected trigger lock- 111 h rlggl ging bolt or antornatieally locking said While I have illustrated twill r bed 7 trigger and 'latelrin closed position, and certain details of construction in this pre means in said handle grip for releasing said ferred form of the hook, it is to be undertrigger. locking-bolt. i stood that the invention is not limited 8. A safety hook comprising a casting, thereby, but that any desired modifications a slotted hook formed in Said. oastii'ig, a

3. A safe y hook comprising a hook on said trigger and head on sa'd' shank operable locking bolt release means in said handle grip formed on said casting, a ing and locking said latch upon engagement weight operated trigger slidably disposed by the hook with a member to be lifted, in the slotted portion of said hook, a shank and means for automaticallyretuming the extending from said trigger, a lateral enlatch to open position.

larged head on said shank above said trig- 10. A safety hook comprising a hook ger and provided with a bolt keeper remember, a latch, means for automatically cess, a latch for closing said hook, arms on moving said latch to operative and inoperasaid latch straddling said head and pivottive positions, and means for automatically ed at one end to said casting, operating conlockin said latch in operative position. nection between said arms an trigger head, 11. safety hook comp-rising a hoo a locking bolt in said casting for engaging member, a latch, means for automatically the keeper recess in said head to lock said moving said latch to operative and mophead and latch in closed latch position, erative positions, means for automatically spring projection means for said bolt in locking said latch in operative position,

' said handle grip, and a supplemental handle and manually operable release means for grip associated with said locking bolt for said locking means. release thereof. In testimony whereof I aflix my signa- 9. A safety hook comprising a hook memture. her, a latch, means for automatically clos- WINTFORD P. CUNNINGHAM. 

